Which one of the following phrases most accurately describes paraxial rays?
A)rays that pass through the principal focus
B)any rays that are parallel to the principal axis
C)rays that come to a focus on the principal axis
D)rays close to the principal axis and parallel to it
E)rays close to the principal axis,but not necessarily parallel to it

Question

Quizplus · Accepted Answer

Paraxial rays are those that are close to the principal axis of an optical system, such as a lens or a mirror, but they are not necessarily parallel to it. These rays are used in paraxial approximation to simplify the analysis of optical systems by assuming small angles, which makes the mathematics more manageable.

Which One of the Following Phrases Most Accurately Describes Paraxial